<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
	function addFile(){
		var btn = document.getElementById("btn");
		var newChild = document.createElement("input");
		newChild.setAttribute("type", "file");
		newChild.setAttribute("name", "upload");
		btn.parentNode.appendChild(newChild);
		btn.parentNode.appendChild(document.createElement("br"));
	}
</script>
</head>
<body>
<!-- 表单上传文件的专用编码格式enctype="multipart/form-data" -->
	<form action="doUpload" method="post" enctype="multipart/form-data">
		<input type="file" name="upload">
		<input type="button" value="继续添加" onclick="addFile()" id="btn"/>
		<input type="submit" value="上传"><br/>
	</form>
</body>
</html>